the enemies of the rose

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Purchase of this book includes free trial access to where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: a solution of sulphate of copper—one ounce in two gallons of water. The surrounding soil should also be similarly treated. It is very important to remember that this wash should be applied during mid-winter, before the leaf-buds begin to swell in the least, otherwise the foliage will be destroyed. ROSE MILDEW (Sphcerotheca pannosa). This is undoubtedly the most destructive and, at the same time, the most prevalent disease with which the grower of Roses has to contend. Like most other parasitic fungi it is sporadic in its appearance; during certain seasons it assumes the proportions of an epidemic, whereas on other occasions it does but little injury, but it is never entirely absent. The waves of serious disease are mainly due to neglect in not fighting the pest when present in the smallest quantity, which means that it is struggling against difficulties, and could much more easily be overcome. The reason why mildew is so much more prevalent during some seasons than others depends almost entirely on the host-plant, and not on the fungus, which is always present in sufficient quantity to set up an epidemic if conditions are favourable. Broadly speaking, " soft" foliage favours the disease, whereas " hard " foliage cannot be so readily infected. This statement is not only true so far as relates to foliage affected by weather conditions, but also as to the relatively hard or soft foliage and shoots of different kinds of Roses. The microscopic structure of the leaf of the " CrimsonRambler" indicates that it could readily be infected, and this proves to be the case with this variety. The greater susceptibility of Roses, and of plants in general, to disease when grown under glass, than when the same kind of plant is grown in the open, depends almost entirely on the relative "...
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